Originally Posted by ex10psi
this may be pure coincidence but i also have the cowbell noise, also in the RR wheel area, and i'm also located in WA state
the noise comes and goes. i'm not certain that its a pebble in the rotor? alex long who's my SA at bmw seattle said he's never heard of any customers reporting this type of noise.
i plan to put my car up on my lift and check around the area. i'll report back what i find.
Elle was my SA at the time - she's now gone apparently.
I believe Trent, one of the shop foremen, was the one to take it out so ask your SA to ask Trent about this. I'm sure he remembers - it was in February. As mentioned throughout this thread, there appear to be several different causes (ie e-brake, heat shield, rotor, etc). Good luck and keep us posted.